Compare text and find differences
Compare two texts or code files and highlight added, removed and changed lines in split or unified view. Free, private, runs in your browser.
- Files never leave your device
- Free, no sign-up
- No watermark
About Diff Checker
Spot every change between two versions of a document, config file or piece of code. Paste the original and modified text, compare, and see additions, deletions and unchanged lines highlighted in a side-by-side split view or a unified diff. Swap the inputs, load a sample, and copy the result. Comparison happens in your browser, so contracts and private code never leave your device.
How to use Diff Checker
- 1
Paste the original text on one side.
- 2
Paste the modified text on the other.
- 3
Click Compare.
- 4
Switch between split and unified views.
Why use this tool
- Split and unified diff views.
- Highlighted additions and deletions.
- Swap inputs in one click.
- Works with code, config files and prose.
- Private: nothing is uploaded.
Frequently asked questions
A single-column view that shows removed lines with - and added lines with +, like git diff.
Yes. It works with any text, including source code, JSON, YAML and SQL.
Copy the text out first, for example with PDF to Text, then paste both versions here.
Large texts work, though very long files take longer to compare on slower devices.
Yes. The comparison never leaves your browser.
No. Everything is processed in your browser tab. Nothing you type or paste is sent to CodeMites or any other server.
Yes. There is no account, no watermark and no usage limit. The tool runs in your own browser, so there is no server cost to charge you for.
Yes. It runs in any modern browser on Android and iOS as well as on Windows, macOS and Linux, with nothing to install.
Yes, once the page has loaded. Everything runs in your browser, so you can keep working on a train or plane without a connection.
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